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Nucleotide sequence of a cloned cDNA copy of TMV (cowpea strain) RNA, including the assembly origin, the coat protein cistron, and the 3′ non-coding region

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Summary

The cloned cDNA derived from the 3′ end of cowpea strain (Cc) RNA of tobacco mosaic virus (TMV) has been sequenced. Substantial sequence information of 1,060 nucleotides from the 3′ end of the RNA reveals some interesting features: (1) the coat protein cistron corresponds to residues 210–701 from the 3′ end. Some errors in the amino acid sequence previously reported have been corrected and the revised total length of the coat protein is 162 amino acid residues. The capping site of the coat protein mRNA is at residue 711 from the 3′ end of genome RNA. (2) The assembly origin of reconstitution is positioned within the coat protein cistron at residue 369–461 which can be formed into a highly base-paired hairpin loop structure. The sequence, GAXGUUG, in the loop region and a triplet-repeated purine base tract surrounding the loop are found. These structural features are common to assembly origins of both Cc and vulgare strains. (3) We find the sequence highly homologous to, but distinct from, the genuine assembly origin. It will be called the pseudo-assembly origin, which is located in the corresponding region to the assembly origin of the vulgare strain, outside the coat protein cistron. There is also the sequence, GAXGUUG, in the middle of the region. (4) In the 5′ flanking region of the coat protein cistron, a long reading frame, probably of 30 K protein, is found. The coding region is terminated in the coat protein cistron and thus the 30 K protein and the coat protein cistrons overlap. (5) The 3′ non-coding region is 209 residues long and can be folded into a possible tRNA-like structure. Surprisingly, we find that the 3′ terminal sequence of Cc RNA is not very similar to that of vulgare RNA but extensively homologous to that of turnip yellow mosaic virus (TYMV) RNA.

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Communicated by T. Yura

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Meshi, T., Ohno, T., Iba, H. et al. Nucleotide sequence of a cloned cDNA copy of TMV (cowpea strain) RNA, including the assembly origin, the coat protein cistron, and the 3′ non-coding region. Molec. Gen. Genet. 184, 20–25 (1981). https://doi.org/10.1007/BF00271189

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